ates patemi



1 Feb. 26, 1929. 1,703,381

BECKER SAFETY GOVERNQR FOR TWO-STROKE ENGINES DESIGNED FOR THEPROPULSION 0F VEHICLES Filed July 15. 1926 II III Patented Feh. 26,1929.

UNETED STATES;

HEZNRICH .Q'ERM artist v tinsel r caries.

SIG'NOR T0 KItUl-PP bl, GEEILJIANY.

my, L l

Application filed. July 15, 1926, Serial No.

In engines used for the propulsion of vehicles, such as in ship engines,the number of revolutions of which is regulated by hand, it is customaryto provide a safety governor for preventing the admissible naximum speedfrom being exceeded, this governor entering into action andautomatically stopping the engine only upon a certain speed beingexceeded.

The invention has for its object to provide a safety governor of thekind stated which is adapted to be used for two-stroke internalcombustion engines.

In twostroke internal combustion engines comprising a scavenging pumpwhich is driven by the engine itself, the pressure of the scavenging airrises in accordance with the increase of the speed of the engine. lhisinter-dependence of the pressure of the scavenging air and the speed ofthe engine is made use of by the invention, according to which there isused as a safety governor a piston which is spring-loaded on one sideand placed under the action of the scavenging air on the other side.

The spring used in the overnor is dimensioned so that at a certainmaximum number of revolutions of the engine the piston is moved in acylinder by the scavenging air contrary to the action of this sprin Thismovement of the piston is utilized for stepping the engine in the usualway by cutting off the fuel. To this end, there is provided between thepiston and the fuel pump a mechanical connection such as is also thecase in the ordinary centrifugal governors.

In order that the invention may be more readily understood, it will nowbe described with reference to the accompanying drawing whichillustrates an embodiment of the invention in section.

A designates a controlling piston movable in a cylinder 18 and havingits piston rod 0: encircled by a compression spring D. C is thescavenging air conduit which opens into the cylinder B at the top endthereof. The lower portion of the cylinder is in communication with theatmosphere through an opening 6 Connected with the piston rod c is onearm of an equal-armed lever E which is mounted for rocking motion in a.bearing F. The other arm of the lever E carries a set screw 0 G is adiagrammatically illustrated fuel pump and g is the associated 122,700,and in Germany December 3, 1925.

tappet resigned to open the suction valve.

W hen the engine is running at normal speed and the pressure of thescavenging air is consequently normal too, the pressure of he scavengingair acting on the upper surf'ltCG of the piston. A and the tensionalforce f the sprin l) acting on the lower surface piston balance eachother. if the speed f the of the engine increases, the pressure of thescavenging air is likewise increased as mentioned already in theintroductory part of this specification. The increase of the pressure ofthe scavenging air produces a downward IllOX GHIEHB of the piston A sothat the piston rod a inparts to the lever E a rotation incourier-clockwise direction. The right hand arm of the lever with theset screw 6 is thereby caused to approach the suction valve tappet g ofthe fuel pump. The set screw 6 is adjusted in such a manner that, uponthe admissible maximum speed of the engine being exceeded, the screwstrikes against the suction valve tappet thereby pushing the valve openand interrupting the feed of the fuel pump. When the engine reduces itsspeed again to the normal number of revolutions, the scavenging air alsore-as sumes its normal pressure. The piston A thus relieved movesupwardly under the action of the spring D and withdraws the set screw 6from the valve tappet 9 so that the normal fuel feed is again started.

If the engine comprises already a control-- ling piston influenced bythe pressure of the scavenging air, such as for re;, ;ulating theblowing-in pressure, it will of course be preferable to pivotallyconnect the rods for actuating the above-described safety governor withthis controlling piston.

Claims:

1. A. safety governor for two-stroke internal combustion engines,comprising a cylinder, a piston movable in the cylinder, said pistonbeing spring-loaded on one side and placed under the action of thescavenging air on the other side, and a two-armed lever con nected byone arm with the piston and hav ing its other arm arranged to actuatethe suction valve of the fuel pump so as to open it upon theadmissiblenumber of revolutions being exceeded.

2. In a two-stroke internal combustion engine having a compressor forscavenging air and a fuel pump, a safety governor comprising pneumaticlneansnnder L lle conte'ol of the scavenging air pressure and directlyconnected to said fuel pump for controlling the "fuel supply to theengine.

3. A safety governor for two-stroke internal combustion engine&comprising cylinder, a piston movable in the (:ylln said de and pistonbeing spring loaded on one s1 placed under the action of me scavengingair on the other side, means for directly connecting said piston to thefilel feeding means For controlling the so me.

The foregoing speci fioeluion signed at Hem- 1% day June, 1926.

BECKER.

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